Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 71
Power Component Definition and Maintenance Chapter 2
See Table 3 on page 68 to determine the appropriate snubber resistance value
for the current rating of the SGCT used.
If the resistor is found to be out of tolerance, see page page 76
for detailed
instructions on replacing the snubber resistor assembly.
Snubber Capacitance (SGCT Device)
Turn the multimeter from the resistance to capacitance measurement mode.
Verify the snubber capacitor by measuring from the test point to the heatsink
adjacent to the right for standard rectifiers, or from heatsink to heatsink. For
SPS rectifiers, measure from the test point to pin 1 of the Phoenix connector
that plugs into J1 of the SPS board (disconnect the J1 connector from the SPS
board first).
Figure 59 - Snubber Capacitor Test
Heatsink Heatsink
Snubber
Resistor
Snubber
Capacitor
Sharing Resistor
SGCT
Test Point
Measure capacitance
between heatsink
and test point (or
from heatsink to
heatsink)
Snubber test point
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